Greenish-yellow azo dyestuff and process of making same



Patented Oct. 4, 1927.

UNITED STATES PATENT OFFICE.

HERMANN WAGNER, or SODEN-ON-THE-TAUNUS, AND ALBERT rUNxn, or nocnsroN-THE-mAI GERMANY, ASSIGNORS T GRASSELLI DYESTUFF CORPORATION, on NEW YORK, N. Y., A CORPORATION or AMERICA.

GREENISH-YELLOW AZO DYESTUFF AND PROCESS OF MAKING SAME.

No Drawing.

We have found that a valuable insoluble greenish-yellow azo dyestufi is obtained, beingof an excellent fastness to light and oil,

v by coupling diazotized 4schloro-2-nitraniline 5 with aceto acetic para chloranilide. The dyestufl has the following formula:

- The dyestuflf may for instance be prepared as follows 34, 4 parts by weight of 4-chloro-2-nitraniline are diazotised in the usual manner. The diazo solution is run into an aqueous suspension of 43.6 parts of aceto-acetic-parachloranilide to which the required quantity of sodium acetate has been added in order to facilitate the reaction. The coupling proceeds quickly and is immediately complete. The resultin azo dyestuff is then' filtered by suction and ied. It forms a yellow pow- Application filed October 8, 1925. Serial No. 61,300.

bein a eenishellow owder.

In tes t i mony viihereoff we afix our signatures.

DR. HERMANN WAGNER. DR. ALBERT FUNKE. 

